21201102020102 has 4 divisors (see below), whose sum is σ = 31801653030156. Its totient is φ = 10600551010050.

The previous prime is 21201102020093. The next prime is 21201102020107. The reversal of 21201102020102 is 20102020110212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201102020107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300275505024 + ... + 5300275505027.

It is an arithmetic number, because the mean of its divisors is an integer number (7950413257539).

Almost surely, 2^{21201102020102} is an apocalyptic number.

21201102020102 is a deficient number, since it is larger than the sum of its proper divisors (10600551010054).

21201102020102 is a wasteful number, since it uses less digits than its factorization.

21201102020102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10600551010053.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21201102020102 its reverse (20102020110212), we get a palindrome (41303122130314).

The spelling of 21201102020102 in words is "twenty-one trillion, two hundred one billion, one hundred two million, twenty thousand, one hundred two".